Answer
$x^2-9$
Work Step by Step
Using $
(a-b)(a+b)=a^2-b^2
$, then,
\begin{align*}
(x-3)(x+3)
\Rightarrow
x^2-3^2
\\=
x^2-9
.\end{align*}
Intermediate Algebra (6th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321785045
ISBN 13:
978-0-32178-504-6
Chapter 5 - Section 5.6 - Factoring Trinomials - Exercise Set - Page 304: 89
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